This script should setup nginix

setup_nginx.sh

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 561F9B9CAC40B2F7
sudo apt-get install apt-transport-https ca-certificates
echo 'deb https://oss-binaries.phusionpassenger.com/apt/passenger precise main' > /etc/apt/sources.list.d/passenger.list
sudo chown root: /etc/apt/sources.list.d/passenger.list
sudo chmod 600 /etc/apt/sources.list.d/passenger.list
sudo apt-get update -y

sudo apt-get -y install nginx-extras passenger

sed -ie 's/# passenger_root/passenger_root/' /etc/nginx/nginx.conf
sed -ie 's/# passenger_ruby/passenger_ruby/' /etc/nginx/nginx.conf

echo "server {
  listen 80;
  root /var/www/current/public;
  passenger_enabled on;
}" > /etc/nginx/sites-enabled/default

/etc/init.d/nginx start